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The concept of ‘seeing sound’ might seem preposterous, but when you consider that sound is just compressed air travelling in waves, the idea becomes a bit more logical. The real trick is capturing air flow in a way that makes it perceptible to the human eye. Through some clever tricks, scientists are able to do just that using a technique called Schlieren flow visualisation, which is used to study everything from heat and sound to aerodynamics and the spread of disease.
Producer: Adam Cole
Video by NPR’s Skunk Bear
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Metaphysics
Knowing if you’re awake seems simple. Why has it vexed philosophers for centuries?
5 minutes
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Ageing and death
Death is a trip – how new research links near-death and DMT experiences
9 minutes
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The environment
Photographs of rainforests dissolving in acid strike a beautiful note of warning
10 minutes
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Technology and the self
Adaptive technologies have helped Stephen Hawking, and many more, find their voice
5 minutes
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Ecology and environmental sciences
Experience the dazzling displays that fireflies create when humans are far away
5 minutes
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Stories and literature
Solaris and beyond – Stanisław Lem’s antidotes to the bores of American sci-fi
7 minutes
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Ecology and environmental sciences
To renew Yosemite, California should embrace a once-outlawed Indigenous practice
6 minutes
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Music
Before the Beatles dropped acid, a BBC workshop was creating far-out sounds
6 minutes
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Philosophy of language
For Ludwig Wittgenstein, language is a game, but not a frivolous one
43 minutes